Buffing wheel



E. W. HALL BUFFING WHEEL Filed Feb. 18, 1930 igB.

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Patented July 4, 1933 UNITED STATES- ATENT OFF-ICE ELISHA WINTHROP HALL, OF MARSHFIELD HILLS .MASSACHUSETTS B FFING' wan EL lApplication' filedi February s, 1930. seriai K074295665.

In other instances, the disks have been secured together by lines of stitching extending at right angles to each other and crossing j each other to form pockets to receive polishing material which frequently is applied to the periphery of the buffing wheel.

" In usual constructionsthe wearing away of the periphery of the wheel breaks out the stitches at the periphery and permits the disks to flex atirregular portions of the periphery, thereby preventing the wheel 2 from producing a uniform polishing action upon the material. V The object of the present invention is broadly to provide a bufling wheel comprising a'plurality of assembled thin disks of fibrous material secured together by lines of stitches presenting repeated zigzagged designs in which the stitches extend alternately in different directions and preferably in which each stitch extends in an abruptly different direction from the next preceding stitch of said design and which stitches join the plies together at closely adjacent inter- F vals, so that the wearing away or breakage of any stitch will not free the plies of fabric for any substantial distance inwardly from the worn periphery.

' The invention contemplates broadly' the assemblage ofa plurality of thin fibrous disks by lines of stitches of this character in any desired manner according to the. softness or hardness of the desired working peripheral surface of the disk, whereby the disk will be worn with substantial uniformity throughout its periphery. Desirably the buffing wheel comprises a central area in I A further ob ect of the invention is to pro- I 75 of an adjacent line or spiral.

which the plies of fibrous material are se- 7 cured together by spiral lines of, plain stitchingwith the spirals thereof arranged at such intervals as will provide the desired degree of rigidity. Where a soft 'disk is' required the plies of the outer zone of the wheel may, be secured together by radial lines of stitch ing of the character above described arranged 'atsuitable intervals. 'Where a relatively I hard buffing wheel is required the peripheral zone, which forms the working area" of thewheel, desirably is provided with a wide line i or wide lines of stitching presenting zigzagged patterns whichare substantially concentric with the periphery of the ,disksand in which the stitches join the disks'at such close intervals that the wearing awayof the stitches at the "periphery will not materially loosen the other stitches which join the disks together, thereby maintaining the peripheral Q bu-fiing surfaces substantially uniform until. the disks are worn down substantially to the depth of said working zone.

vide a buffing wheel comprising a plurality of assembled thin disks of fibrous material having a peripheral zone forming the work- I ing area in which the disks are secured together by a spiral line of stitches presenting a repeated design in whicheach stitch of thedesign extends in a difleren't direction from the next preceding stitch of the design and in which the stitches are relatively short and 'join the plies together at closely adjacent intervals both radially and peripherally.

A further object of the invention is f to join'the disks by a concentric or spiral line of stitches presenting a repeated zigzag design of such character that the area of thedesign'of successive concentric circles or successive spi rals will overlap the area of the design of the next outer concentric line or spiral, and in which the stitches of the design of one I line will seldom,if ever, intersect the stitches These and other ObJGCtS and features of the invention'will more fully appear from the following description and the accompanying drawing and will be particularly pointed out in the claims.

In the drawing: Fig. 1 is a plan view of a bufilng wheel comprising a plurality of assembled disks in which the disks are secured together throughout the peripheral zone forming the working area by a spiral line of stltches presenting repeated designs in which the stitches extend alternately in abruptly diflerent Cllrections and join the plies at closely adjacent intervals; I

Fig. 2 is aplan comprising a plurality of assembled disks having a central zone secured together by a repeated zigzag design are concentrically ar-' ranged in the working zone and having also radial lines of stitching of like character;

Fig. 4 is an enlarged sectional view of the edge of the disk illustrating the manner in which the stitches are concatenated and serve to. join the disks together at closely adjacent intervals; and,

Fig. 5 is an edge view of a bufier comprising a plurality of bufling wheels of the character described clamped upona rotat- .ingarbor.

The butting wheel, as illustrated in Fig. 1 of the drawing, comprises a plurality of fibrous disks 1 which may be of cotton fabric, such: as. cotton duck, or other suitable material, which desirably are assembled in such angular relation to each otheras to stagger the direction of the lines of warp and weft in the respectlve disks or'plies. The

disks 1 are assembledwith the flat :tac-es there of contacting with each other and are pro ,vided with a central zone 2 in which the assembled disks are secured together by a spiral lineof usual straight stitches In the peripheral or working zone 41 the disks or plies.

of fibrous material are secured together by a wide spiral line of stitching 5 presenting a repeated design in which the stitches extend alternately in cilierent directions and in which each stitch preferably Xtends in an abruptly different direction from the next preceding stitch in the design.

on opposite sides of a median In this construction each stitch extends in :a direction at right angles to the next preceding in such a manner as to form connected zigzagged trefoil designs 6 and 7 which lie ing the direction otthe line of stitching or in a Zig-zag course. By reason of this construction certain of the stitches extend in substantially radial directions while others view of a butting wheel In Fig. 2

extend in directions substantially concentric with the periphery ot the wheel and the anchorages afforded by these stitches are closereason of this construction the disks or plies oi? 'librous material are anchored together at very closely adjacent intervals both radially and v circumferentially. The stitches unitthe layers of fibrous material desirably are look stitches with the needle thread maintained under sullicient tension to draw the concatenating loops of the'needle thread and locking thread wellinto the interior of the buliing wheel, so that where the concatenated thread. is worn out during the bufiing opera tion the release of the ends of such worn thread will not cause unravelling of the next preceding stitch which likewise is locked into the body of the assembled butting wheel.

lt, therefore, follows that as the wheel wears a substantially uniform surface is maintained and this is particularly important where a series of butling wheels are assembled together, as illustrated in F ig. 5, to

produce a butter for relativelyiflargesuriiaces.

The concatenations of the stitches are illustratedin Fig. l which shows agroup of needle thread exposed and concatenated with the loop of locking thread, with the next ceucal'enating loop of each embedded su'liiciently into the material to hold the plies together until the wheel has worn down to such loop. p a soft builing wheel isillustrated in which the disks or plies of fibrous material are secured together by substantially 1'ad1al hues of stitch ng of the same characand comprising lines of stitches presentmg a repeated design in which the stitches extend alternately in difierent directions and join the plies of the bufiing wheel throughout the area of the radial line'of stitching at closely adjacent intervals. Y I I The repeated designs of the lines of stitch-.

ing desirably are arranged in zig-Zagrelation to secure the plies of fabric together through radial areas of substantial width, thereby very materially stiffening the disk,

so that when in use it will notreadilybuckle" when the article being buffed isipressed againstit. Such stifilening of the disk not only increases the efliciency, but also ,materially increases the length of life of the disk.

The portion of the butting wheel between the radial lines of stitching may be relatively free, as illustrated, or the bufling wheel may be provided with a suitable relatively hard zone, as illustrated'in Fig. 1, in which case the radial lines of stitches will secure the disks or pliesof fibrous material together along radial lines separated from each other at suitable intervals, while the disks at the peripheral zone or working area of the Wheel will be secured together by concentric or spiral lines of stitches of the character above described. Such a construction is illustrated in Fig. 3 in. which a plurality of concentric circular lines of stitchesof the character above described serve-to secure the disks or plies of fibrous material together at the peripheral or working zone, while the disks are secured together at an intermediate or central zone by radial or spiral lines of stitching.

It will be understood that the particular embodiment of the invention which is disclosed herein is of an illustrative character and is not restrictive, and that various changes in form and design may be made within the spirit of the invention and of the following claims, provided that the'stitches, which form the design of the line of stitching, are so arranged as tojoin the disks or plies of the bufling wheel at such close intervals and in such manner that the wearing away of one or more stitches of the design will not cause or permit substantial separation of the plies any considerable distance from the peripheral working edge of the bufiing wheel.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is: 1

' 1. A butling wheel comprising a plurality of assembled thin circular disks of'fibrous material having a peripheral zone forming the working area sewed together by a wide spiral line of stitching formed of a succession of short stitches presenting repeated zigzagged designs in which each stitch extends in an abruptly diflerent direction from i ing a peripheral zone forming the Working area sewed together throughout said Working area by a wide narrowly spaced spiral line of stitching formed of a succession of short stitches" presenting arepeated Zigzagged trefoil design and in which the area of the design of each inner convolution overlaps an area of a like design of the next outer convolution'. without intersection of the stitches forming the respective designs.

3. A buffing wheel comprising a plurality of assembled disks of thin fibrous material having 'a peripheral zone forming the work ing "area sewed together throughout said working area byia wide narrowly spaced spiral line of stitching formed of a succession of short stitches presenting a repeated zigzagged trefoil design and in which the area of the design of each inner convolution overlaps an area of a like design of the next stitches presenting repeated zigzagged trefoil desig'ns extending fromapproximately the center of the wheel to the working area thereof.

, In testimony whereof, I have signed my name to. this specification.

ELISHA WINTHROP HALL. 

